Electric heater.



PATENTED APR. 26, 1904.

3. EOKM AN N. ELECTRIC HEATER.

APPLICATION FILED AUG. 16, 1902 I0 MODEL.

(Illl'l lia /11hr j/Jldfii'mamn Patented April 26, 1904.

UNITED STATES PATENT OFFICE.

ERNST EGKMANN, OF BERLIN, GERMANY, ASSIGNOR TO MARTIN PETER- SEN, OFFRIEDRICHSGABEKOOG, SCHLESWIGr-HOLSTEIN, GERMANY.

ELECTRIC HEATER.

SPECIFICATION forming part of LettersPatent No. 758,303, dated April 26,1904.

Application filed August 15, 1902. Serial No. 119,718. (No model.)

To all whom it may concern:

Be it known that I, ERNST ECKMANN, engineer, a citizen of the Kingdom ofPrussia, and a resident of Berlin, Germany, (whosepostoffice address isSteglitzerstrasse 40,) have invented certain new and useful Improvementsin Electric Heaters, of which the following is a specification.

This invention relates to an improved electric heater consisting of aframe carrying the wires heated to incandescence by an electric currentand -so disposed that an air-current supplied by a fan is caused to passover said heated wires, and thus become heated by cooling the wires. Theelectric current utilized for heating the wires also drives theelectromotor. Upon the motor-shaft is mounted a suction-fan that inducesthe air-current and draws air through the parts of the electric motorwhere the same becomes already slightly heated, while effectuallykeeping the motor cool. If the suction-fan is arranged for suction fromboth sides,it may advantageously be caused to draw air and refrigeratethe motor from one side, as previously stated, while on the other sidethe resistance connected in front of the motor is disposed in thesuction-channel.

The invention will be more readily understood with reference to theaccompanying drawings, in which Figures 1 and 2 are a sectional sideelevation and a plan, respectively, of an apparatus embodying theinvention shown by way of an example.

a is the electrom0tor;on the prolonged shaft 6 of which is mounted afan-Wheel 0, arranged to rotate within a suction-casing (Z. The bladesof said fan-wheel c are advantageously curved in the rearward direction.The casing f, inclosing the electric motor a, is integral with theexhauster-casing d and is formed with orifices g for the entrance of airto the armature. In the delivery or discharge pipe h of the suction-fanare mounted frames e', on which are stretched wire 7' having highspecific resistance, so that by the passage of the electric current theybecome heated to incandescence. I find it advantageous to so mount thesaid frames c' in theinterior of the delivery-pipe as to dispose thewires in the successive frames 5 at right angles to each other.

It may not always be convenient in alarge apparatus of this kind to passthe entire volume of air moved by the fan through the electric motor,and in such case the other sidewall of the suction-fan is provided witha central aperture k, and the air thus entering may then be slightlyheated by disposing in said aperture one or more frames carryingresistancewires which are electrically connected in front of the motor.

The air When drawn in will at once be warmed before entering thesuction-fan and at leaving the latter becomes strongly heated by passingbetween and around the incandescent Wires j 5 at the delivery end and isthen discharged into the room for heating the same.

The hot-air current should be directed toward and delivered near thefloor into the room to be heated. This may be eifected either by 7directing the delivery end of the pipe 7L downward or by obturating thedelivery end of such pipe by means of downwardly-deflecting boards orstrips a, similar to those adopted for Venetian blinds or ventilators.These latter also serve the purpose of preventing short-circuiting,intentional or otherwise, by the insertion of foreign bodies orsubstances.

The entire apparatus may be placed in the interior of a casing of anysuitable form. For example, it may present the appearance of a stove.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, 8 5 I declarethat what I claim is 1. In combination, a cylindrical casing hav ing anopening in the side and having a tangential opening, a fan rotating insaid cylinder an electric motor driving said fan, and 9 electricconducting-wires in said openings, substantially as described.

2. In combination, a cylindrical casing having an opening in one sideand an integral projecting-motor-casing on the other, a fan in saidcylinder, a shaft carrying said fan andextend ing through saidprojecting moter-casl In testimony whereof I a'l'lix my signatm'e ining, said casing having 01 )ening's leading to the presence of twowitnesses. outside air and to the interior of the cylinder, an electricmotor in said casing, said cylinder 5 having a tangentialdelivery-opening, and elec- WVitnesses:

tric conducting-Wires in said side and delivery VVOLDEMAR HAUPII,openings, substantially as described. lilENRY l-IAsPmn.

ERNST EC KM A N N.

